The Guardian:
As Sereth's holo-projector activates, a shimmer of static passes over him. His build does not alter, but his features do: they resolve into those of a striking, dark-skinned human male with a shaven scalp. However, the essential structure of his commanding features remains the same, and he remains recognizably Sereth to the others.
Meanwhile, Sereth's robes and symbols of office morph and shift, until he appears to be wearing a dark, full-length double-breasted overcoat, over a thousand-dollar three-piece Armani suit with subtle, refined pinstriping. His badge of office appears as a brushed silver lapel pin -- its abstract design is unremarkable in this form.
It is weird how Sereth's human disguise still looks like Sereth. The way that he still has the same height and other general features probably plays a role in that.
"That is a nice suit." Stanley tries his best not to sound envious. He knows, because he has seen the device activate, that it is just a hologram, but for the random person on the street it looks real. Also really expensive.
Stanley steps out of the Tardis and looks around. He can't help but think that it is not as impressive as some of the previous destinations. It is only a small jump back in time and they are still on Earth, so it is no wonder that everything looks normal and familiar. "Nothing out of the ordinary, as far as I can tell."